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Hario the company has been dedicated to the design, production, and sale of heatproof glass since it was founded in 1921 and is the only heatproof glass manufacturer in Japan to have a factory. At the time of founding, glass products for science laboratories and medical uses were produced and sold. After World War II, production of household items began starting with the coffee syphon. Since then, the company has expanded to production of items such as coffee equipment, equipment for tea, Japanese teas and herb teas, microwave-safe cooking equipment, kitchenware, aroma therapy, and pet products.